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Movies like Two Way Mirror (1981)

Used as a rendezvous for illicit lovemaking, two Paris apartments have a devilishly deceptive TWO-WAY Mirror installed between the bedrooms. Let's take a peek at what goes on when a married couple inherits a key to each separate love nest...without each other's knowledge. What you see is what you get in this passionate saga of lusting spouses that's worth looking into!